Well 20 units per store is certainly makes for a nice chance of actually getting a unit. Let's hope there's not too much trouble finding one at launch, and people don't feel the need to turn to resellers to grab one.

Target currently has 1,816 stores in the US. Which would mean that, nationwide, Target's launch stock of the SNES Mini is, at minimum, 36,320 consoles. Granted, they're not the only ones selling it. Best Buy, GameStop, Toys R Us (who is currently undergoing chapter 11 bankruptcy), and Walmart will all have it, too. That's excluding online sales, too (i.e. Amazon and the other retailers' online stock).